_id	variable	code	description	ref
1	group	HW	Health and Wellness Education	""
2	group	TC	Tai Chi	""
3	condition	DTO	Dual-task standing condition; two trials: DTO1 and DTO2	""
4	condition	QSO	Eyes-open standing condition; two trials: QSO1 and QSO2	""
5	condition	QSC	Eyes-closed standing condition; two trials: QSC1 and QSC2	""
6	Total Duration	""	 Total Duration (seconds): total duration captured by the MobilityLab (accelerometer) during standing	""
7	Total sway area of the accelerometer	""	 Total sway area (m^2/s^5): total sway area, computed as the area included in the sway trajectory per unit of time  	""
8	95% ellipse sway area of the accelerometer 	""	 95% ellipse sway area (m^2/s^4): area of the 95% confidence elipse encompassing the sway trajectory in the transerve plane	""
9	Mean velocity of the accelerometer (AP)	""	 Mean velocity (AP) (m/s): mean velocity of the lumbar's trajectory in the anterior-posterior direction 	""
10	Mean velocity of the accelerometer	""	 Mean velocity (m/s): mean velocity of the lumbar's trajectory in the transver plane	""
11	Mean velocity of the accelerometer (ML)	""	 Mean velocity (ML) (m/s): mean velocity of the lumbar's trajectory in the medial-lateral direction 	""
12	Mean distance of the acceleration trajectory (AP)	""	 Mean distance (AP) (m/s^2): mean distance of the lumbar's acceleration trajectory from the center of this trajectory in the anterior-posterior direction	""
13	Mean distance of the acceleration trajectory	""	 Mean distance (m/s^2): mean distance of the lumbar's acceleration trajectory from the center of this trajectory in the transverse plane	""
14	Mean distance of the acceleration trajectory (ML)	""	 Mean distance (ML) (m/s^2): mean distance of the lumbar's acceleration trajectory from the center of this trajectory in the medial-lateral direction	""
15	Path length of the acceleration trajectory (AP)	""	 Path length (AP) (m/s^2): total length of the lumbar's acceleration trajectory in the anterior-posterior direction	""
16	Path length of the acceleration trajectory	""	 Path length (m/s^2): total length of the lumbar's acceleration trajectory in the transverse plane	""
17	Path length of the acceleration trajectory (ML)	""	 Path length (ML) (m/s^2): total length of the lumbar's acceleration trajectory in the medial-lateral direction	""